CN113025909A - Hot-rolled pickled plate for refrigerator compressor shell and production method thereof - Google Patents
Hot-rolled pickled plate for refrigerator compressor shell and production method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/225—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length by hot-rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2265/00—Forming parameters
- B21B2265/10—Compression, e.g. longitudinal compression
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2267/00—Roll parameters
- B21B2267/18—Roll crown; roll profile
- B21B2267/19—Thermal crown
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/005—Ferrite
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Abstract
The invention discloses a hot-rolled pickled plate for a refrigerator compressor shell and a production method thereof, and relates to the field of hot-rolled pickled household electrical appliance plates. The invention relates to a hot-rolled pickled plate for a refrigerator compressor shell and a production method thereof, wherein the hot-rolled pickled plate comprises the following main chemical components in percentage by weight: c: 0.035-0.060%, Si is less than or equal to 0.030%, Mn: 0.30-0.50%, P is less than or equal to 0.020%, S: less than or equal to 0.012 percent, Al: 0.025-0.050%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurity elements; reheating a casting blank by a heating furnace, rolling on a continuous hot continuous rolling mill, sequentially carrying out rough rolling, finish rolling, laminar cooling and then coiling to produce a qualified hot rolled coil; hot rolling to improve the plate shape and transverse printing, and acid washing to obtain the final product.
Description
Technical Field
The invention relates to the field of hot-rolled pickled household appliance plates, in particular to a hot-rolled pickled plate for a refrigerator compressor shell and a production method thereof.
Background
The hot-rolled pickled steel plate is widely applied to the fields of automobiles, household appliances, machinery and the like. Compared with cold-rolled sheets, the cold-rolled sheet has the characteristics of low cost, excellent forming performance, thick specification production and the like; compared with a hot rolled plate, the hot rolled plate has the advantages of smooth surface, excellent plate shape, high dimensional precision, direct coating without sand blasting treatment and the like. With the upgrade of production lines and the improvement of technical level of large iron and steel enterprises in China, the performance stability and the surface quality of pickled plates are gradually approaching to those of cold-rolled plates, and the pickled plates are gradually expanded in the fields of household appliances, automobiles, machinery and the like instead of cold.
Chinese patent publication No. CN104946969B discloses a hot-rolled pickled steel plate for an air conditioner compressor shell and a manufacturing method thereof, wherein the hot-rolled pickled steel plate comprises the following chemical components in percentage by weight: c: 0.015% -0.040%, Si: 0.005-0.035%, Mn: 0.15-0.35%, P is less than or equal to 0.018%, S is less than or equal to 0.015%, N is less than or equal to 0.0050%, Al: 0.020-0.055 percent, and the balance of iron and inevitable impurities. The acid washing plate is suitable for air condition compressors with low requirement on forming performance, but the problems of material shortage and continuous cutting of rim charge occur when the refrigerator compressor shell with high requirement on stamping performance is produced, and the defects of surface transverse printing easily occur due to low material strength.
Chinese patent publication No. CN102409223B discloses a low yield ratio hot-rolled pickled plate and a production method thereof, wherein the component range of the plate is added with higher contents of C and Mn elements, and the contents are 0.04-0.12% and 0.8-1.5% respectively; and also B element is added. Through this patent capability test, the intensity of steel sheet is higher, and yield strength mean value reaches 344.5MPa, if when carrying out main casing body roller circle and take shape, middle gap can be great, welds badly when leading to follow-up plasma welding. In addition, the addition of B element is not beneficial to welding.
Disclosure of Invention
1. Technical problem to be solved by the invention
Aiming at the unstable forming performance of the low-alloy pickled plate in the prior art, the hot-rolled pickled plate for the refrigerator compressor shell and the production method thereof are provided, and the hot-rolled pickled plate for the refrigerator compressor shell, which has excellent forming performance, good plate shape and better economical efficiency, is produced by reasonable chemical component design and matching with hot rolling and pickling processes.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
a hot-rolled pickled plate for a refrigerator compressor shell comprises the following main chemical components in percentage by weight: c: 0.035-0.060%, Si is less than or equal to 0.030%, Mn: 0.30-0.50%, P is less than or equal to 0.020%, S: less than or equal to 0.012 percent, Al: 0.025-0.050%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurity elements; the microstructure of the hot-rolled pickled steel plate is ferrite, a small amount of pearlite and a small amount of carbide, the grain size level of the microstructure is 10-11 levels, the yield strength range is 260-340 MPa, the tensile strength is more than or equal to 390MPa, and the elongation after fracture is more than or equal to 40%.
The reason why the content range of the alloying element in the present invention is limited is as follows:
c: c is the most economical and effective solid solution strengthening element for improving the strength, the content of C is increased, the strength is increased, the content of C is too high, and C exists in undissolved carbide and influences the formability of the steel plate. The actual production process of the steel for the air conditioner compressor shell is combined, the forming, hardness, burr resistance and the like of the steel need to be considered, and the control range of the percentage content of C is 0.035-0.060%.
Si: the Si content is too high to promote the growth of casting crystals in the cast steel and reduce the plasticity, and the Fe is formed on the plate surface when the Si content is too high2O3Is not easy to clean during acid washing, and spots can be formed on the upper surface to influence the subsequent electrophoresisAnd (6) painting. The percentage content control range of Si in the invention is less than or equal to 0.030 percent.
Mn: mn is an important desulfurization and strengthening element in steel. Too low Mn can affect the desulfurization effect and the improvement of the strength of the steel plate. Meanwhile, Mn is an effective element for strengthening and toughening a weld joint, is beneficial to deoxidation in the weld joint and prevents the formation of iron sulfide causing thermal cracks, but the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, a pearlite or bainite banded structure is easily formed at the central part of the thickness of a steel plate, and the banded structure of high-strength steel is easy to cause the delamination defect and is also a crack initiation point of fatigue failure. When the Mn content is controlled within a certain range, the steel not only has enough toughness, but also has higher strength and hardness, and the control range of the Mn percentage content is 0.30-0.50 percent in comprehensive consideration.
P: p is liable to cause segregation, reducing plasticity and toughness. The percentage content of P in the invention is controlled below 0.020%.
S: when the S content is higher, large-size manganese sulfide is easily formed, and the plasticity and the toughness of the steel plate are obviously reduced. The percentage content of S in the invention is controlled below 0.012%.
Al: al is a main deoxidizer and can suppress the formation of other oxides, but the shape of alumina is poor and a large amount of alumina inclusions impair the workability of the steel sheet. With Al2O3There is a risk of clogging the casting nozzle and therefore Al should not be too high. The control range of the Al percentage content is 0.025-0.050%.
N: the N element can seriously reduce the plasticity and toughness of the material. When N exists in a free state in steel, the phenomenon of discontinuous yield of the steel plate is easily caused during uncoiling and subsequent forming, so that the content of nitrogen needs to be limited. The percentage content control range of N in the invention is below 0.0040%.
A production method of a hot-rolled pickled plate for a refrigerator compressor shell comprises the following steps:
adopting molten iron pretreatment, pre-slagging and post-slagging, wherein the target S is less than or equal to 0.005 percent after molten iron S is removed; then the mixture is blown by the top and the bottom of the converter; heating in an LF furnace and ensuring that the stirring time of bottom blowing Ar is more than 5 min; performing vacuum cycle degassing treatment in an RH furnace, and adjusting a target value by adopting a light treatment process; ensuring that the net circulation time before breaking is not less than 4 min; reheating a casting blank by a heating furnace, rolling on a continuous hot continuous rolling mill, sequentially carrying out rough rolling, finish rolling, laminar cooling and then coiling to produce a qualified hot rolled coil; hot rolling to improve the plate shape and transverse printing, and acid washing to obtain the final product.
The further technical scheme is that the temperature of the continuous casting slab is set as follows: the heating temperature of the casting blank in the heating furnace is too high, the surface oxide skin becomes thick, the surface oxide skin cannot be removed completely in the lateral pressure and rough rolling processes, and the residual oxide skin can be pressed into the surface of the steel plate by the roller in the finish rolling process to form an oxide skin compression hole or a pit. These defects are inherited to the pickled finished surface, reducing the surface quality grade and the electrocoating effect of the compressor shell. If the heating temperature is too low, the condition that the final rolling temperature is easy to generate two-phase region rolling and the rheological stress of the steel plate is large cannot be ensured, and the load of the rolling mill is increased. The heating temperature of the plate blank is set to be 1230-1250 ℃.
Further technical scheme, rough rolling finishing temperature: the rough rolling finishing temperature also affects the scale on the surface of the steel plate, and if the rough rolling finishing temperature is too high, excessive secondary scale is formed on the surface of the intermediate billet from a rough rolling unit to a finishing rolling unit roller way, so that the secondary scale is not easy to remove in the finishing rolling process, and the landscape-shaped scale spot defect can be formed on the surface of the steel plate after acid pickling, thereby affecting the appearance of the steel plate. The rough rolling finishing temperature is set to be 1000-1100 ℃.
The further technical scheme is that the finishing temperature is set as follows: the finish rolling process of the invention is rolling in an austenite single-phase region, if the finish rolling temperature is too low, the rolling can be caused in a ferrite + austenite two-phase region, a hot rolling texture which is not beneficial to stamping deformation is formed, the plastic strain ratio of the steel plate is sharply reduced, particularly the anisotropy of the steel plate is increased, and the material shortage or the cracking is easily formed during stamping processing. And if the finish rolling is too high, the iron scale on the surface of the steel plate is serious and is not easy to remove by acid washing. The finishing temperature of the invention is set to 860-900 ℃.
The further technical scheme is that the hot rolling coiling temperature is set as follows: when the hot rolling coiling temperature is too high, the thickness of the surface iron scale is obviously increased in the period from the finish rolling to the coiling, and the subsequent pickling is influenced. If the hot rolling coiling temperature is too low, the strength of the steel plate is increased, and the elongation rate is reduced to influence the forming effect. Taking into account the higher C and Mn content of the present invention, high temperature coiling is adopted. The coiling temperature range set by the invention is 620-650 ℃.
The further technical scheme is that the convexity of the hot rolled steel plate is set as follows: the finish rolling working roll of the hot rolling unit is of a CVC roll shape, and the centering and the shape stabilization of a steel plate can be effectively controlled during hot rolling. The CVC roller type is characterized in that the plate shape has transverse convexity, the thickness difference exists between the middle part and the edge part, if the thickness difference is too large, the punch forming of the edge material of the pickled plate is influenced to generate material shortage, in order to solve the problem of the transverse thickness difference, micro-middle-wave rolling is adopted, C10 is controlled according to 70 +/-15 mu m, C40 is controlled according to 25 +/-15 mu m, the screw-down rate of an F7 rack is less than 10%, and the rolling speed is less than 40 KM. Therefore, the convexity of the steel plate set by the invention is 20-40 um.
The further technical scheme is that hot rolling flattening: the hot rolled coil is hot rolled and flattened before pickling, so that the shape of the hot rolled coil can be effectively improved, and the transverse printing defect can be effectively improved particularly for mild steel. Therefore, the invention needs a hot rolling leveling process, the leveling adopts an elongation percentage mode, and the reduction rate is 2-4%.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) the invention relates to a hot-rolled pickled plate for a refrigerator compressor shell and a production method thereof, wherein the microstructure of the hot-rolled pickled plate is ferrite, a small amount of pearlite and a small amount of carbide, the grain size grade of the microstructure is 10-11 grade, the yield strength range is 260-340 MPa, the tensile strength is more than or equal to 390MPa, and the elongation after fracture is more than or equal to 40 percent, so that the problems of strength mismatching, transverse printing, stamping material shortage, poor trimming edge and the like of the hot-rolled pickled plate produced by the prior art when used for producing the refrigerator compressor main shell are solved;
(2) according to the hot-rolled pickled plate for the refrigerator compressor shell and the production method thereof, the steel plate convexity of the hot-rolled pickled plate is 20-40 um, the finish rolling working roll of the hot rolling unit is of a CVC roll type, the centering and the plate shape stability of the hot-rolled plate can be effectively controlled, and micro-middle-wave rolling is adopted to improve the problem of transverse thickness difference;
(3) according to the hot-rolled pickled plate for the refrigerator compressor shell and the production method thereof, the hot-rolling flattening process adopts an elongation percentage mode, the reduction rate is 2% -4%, so that the problem that the shape of a hot-rolled coil can be effectively improved through hot-rolling flattening before pickling is solved, and the transverse printing defect can be effectively improved especially for soft steel;
(4) according to the hot-rolled pickled plate for the refrigerator compressor shell and the production method thereof, the hot-rolled coil is subjected to the hot-rolling flattening process, the problems of plate shape and transverse printing can be effectively solved, so that additional pickling flattening and straightening are not required, and the pickling production efficiency is effectively improved.
Drawings
FIG. 1 is a metallographic structure diagram of an example;
FIG. 2 is a metallographic structure diagram of a steel sheet having a processing defect.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The hot-rolled pickled plate for the refrigerator compressor shell comprises the following main chemical components in percentage by weight: c: 0.035-0.060%, Si is less than or equal to 0.030%, Mn: 0.30-0.50%, P is less than or equal to 0.020%, S: less than or equal to 0.012 percent, Al: 0.025-0.050%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurity elements; the microstructure of the hot-rolled pickled steel plate is ferrite, a small amount of pearlite and a small amount of carbide, the grain size level of the microstructure is 10-11 levels, the yield strength range is 260-340 MPa, the tensile strength is more than or equal to 390MPa, and the elongation after fracture is more than or equal to 40%.
The reason why the content range of the alloying element in the present invention is limited is as follows:
c: c is the most economical and effective solid solution strengthening element for improving the strength, the content of C is increased, the strength is increased, the content of C is too high, and C exists in undissolved carbide and influences the formability of the steel plate. The actual production process of the steel for the air conditioner compressor shell is combined, the forming, hardness, burr resistance and the like of the steel need to be considered, and the control range of the percentage content of C is 0.035-0.060%.
Si: the Si content is too high to promote the growth of casting crystals in the cast steel and reduce the plasticity, and the Fe is formed on the plate surface when the Si content is too high2O3The paint is not easy to clean during acid washing, and spots can be formed on the upper surface to influence the subsequent electrophoretic painting. The percentage content control range of Si in the invention is less than or equal to 0.030 percent.
Mn: mn is an important desulfurization and strengthening element in steel. Too low Mn can affect the desulfurization effect and the improvement of the strength of the steel plate. Meanwhile, Mn is an effective element for strengthening and toughening a weld joint, is beneficial to deoxidation in the weld joint and prevents the formation of iron sulfide causing thermal cracks, but the Mn content is too high, the Mn segregation degree of a casting blank is increased in the continuous casting process, a pearlite or bainite banded structure is easily formed at the central part of the thickness of a steel plate, and the banded structure of high-strength steel is easy to cause the delamination defect and is also a crack initiation point of fatigue failure. When the Mn content is controlled within a certain range, the steel not only has enough toughness, but also has higher strength and hardness, and the control range of the Mn percentage content is 0.30-0.50 percent in comprehensive consideration.
P: p is liable to cause segregation, reducing plasticity and toughness. The percentage content of P in the invention is controlled below 0.020%.
S: when the S content is higher, large-size manganese sulfide is easily formed, and the plasticity and the toughness of the steel plate are obviously reduced. The percentage content of S in the invention is controlled below 0.012%.
Al: al is a main deoxidizer and can suppress the formation of other oxides, but the shape of alumina is poor and a large amount of alumina inclusions impair the workability of the steel sheet. With Al2O3There is a risk of clogging the casting nozzle and therefore Al should not be too high. The control range of the Al percentage content is 0.025-0.050%.
N: the N element can seriously reduce the plasticity and toughness of the material. When N exists in a free state in steel, the phenomenon of discontinuous yield of the steel plate is easily caused during uncoiling and subsequent forming, so that the content of nitrogen needs to be limited. The percentage content control range of N in the invention is below 0.0040%.
Example 2
The basic structure of the production method of the hot-rolled pickled plate for the refrigerator compressor shell of the embodiment is the same as that of the embodiment 1, and the differences and the improvements are that: the chemical compositions (mass percentages) of the examples of the present invention and the comparative examples are shown in table 1, and the balance is Fe and inevitable impurity elements.
TABLE 1 chemical composition (wt%) of examples and comparative examples
According to the design requirements of the material components, the molten iron pretreatment, the front slag skimming and the rear slag skimming are adopted, and the target S is less than or equal to 0.005 percent after the molten iron is subjected to S removal. Carrying out top-bottom combined blowing in a converter, heating in an LF (ladle furnace) and ensuring that the stirring time of bottom-blown Ar is more than 5min, carrying out vacuum cyclic degassing treatment in an RH (Ruhrstahl-Heraeus) furnace, and adjusting a target value by adopting a light treatment process; and ensuring that the net circulation time before the air break is not less than 4 min.
TABLE 2 Rolling Process parameters of the invention
And (3) reheating the casting blank by a heating furnace, rolling on a continuous hot continuous rolling mill, wherein the process control parameters are shown in table 2, and rolling to produce the qualified hot rolled coil through rough rolling, finish rolling, laminar cooling and coiling. Hot rolling to improve the plate shape and transverse printing, and acid washing to obtain the final product.
The hot-rolled pickled steel plate for the refrigerator compressor shell obtained by the method. Referring to the attached figure 1, the microstructure of the hot-rolled pickled steel plate is ferrite, a small amount of pearlite and a small amount of carbide, and the grain size grade of the structure is 10-11 grades. The yield strength range of the hot-rolled pickled steel plate is 260-340 MPa, the tensile strength is more than or equal to 390MPa, and the elongation after fracture is more than or equal to 40%.
TABLE 3 mechanical Properties of the examples and comparative examples
TABLE 4 actual thickness control of the examples and comparative examples
As can be seen from the performance and actual thickness control of tables 3 and 4, the product produced by the invention has proper strength, good forming performance, excellent surface quality and smaller transverse thickness difference, and effectively solves the problems of material shortage, continuous edge wire cutting, poor coating effect and the like easily caused when the hot-rolled pickled plate produced by the prior art is used for stamping a refrigerator compressor shell.
In this embodiment, the process and the process content are as follows:
(1) pretreating molten iron: and pre-slagging and post-slagging are required, and the target [ S ] is less than or equal to 0.005 percent after molten iron is subjected to S removal.
(2) Smelting in a converter: the tapping is not deoxidized, and the tapping slag-stopping operation is enhanced. Oxygen is blown in and the high-temperature molten iron undergoes an oxidation reaction to remove impurities.
(3) Alloy fine adjustment station: and (3) bottom blowing argon to the ladle to accelerate the movement of molten steel medium, promote the uniform distribution of molten steel components and temperature, reduce the impurities of the molten steel through chemical reaction and clean the molten steel.
(4) And (3) refining in an RH furnace: the molten steel can be mixed quickly and uniformly, the alloy components can be controlled within a narrow range, the gas content is low, the inclusion is less, and the purity of the molten steel is high. Adjusting the target value by adopting a light treatment process; and ensuring that the net circulation time before the air break is not less than 4 min.
(5) The hot rolling process comprises the following steps: the discharging temperature of the casting blank is controlled to be 1230-1250 ℃, hot rolling is a two-section rolling process, rough rolling R1 and R2 are 3+5 passes of rolling, and the finishing temperature of the rough rolling is 1000-1100 ℃. The finish rolling adopts 7-pass continuous rolling, the finish rolling temperature is 860-900 ℃, the slight middle wave rolling is adopted for controlling the transverse same plate difference, C10 is controlled according to 70 +/-15 mu m, C40 is controlled according to 25 +/-15 mu m, the screw-down rate of an F7 frame is less than 10%, and the rolling speed is less than 40 KM. The convexity of the hot rolled steel plate is controlled to be 20-40 mu m in the finish rolling.
(6) Laminar cooling: front-end cooling is employed.
(7) Coiling temperature: setting the temperature to be 620-650 ℃;
(8) hot rolling and flattening: in order to improve the problems of plate shape and transverse printing, the product is leveled by hot rolling, and the leveling elongation is 2-4%.
(9) Acid washing process: and (3) when the leveled hot rolled steel coil is subjected to the pickling process, if the plate shape is good, the hot rolled steel coil is not subjected to straightening and leveling, and if the plate shape is not good, the hot rolled steel coil is subjected to straightening and leveling.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (8)
1. A hot-rolled pickled plate for a refrigerator compressor shell is characterized in that: the hot-rolled pickled steel plate comprises the following main chemical components in percentage by weight: c: 0.035-0.060%, Si is less than or equal to 0.030%, Mn: 0.30-0.50%, P is less than or equal to 0.020%, S: less than or equal to 0.012 percent, Al: 0.025-0.050%, N is less than or equal to 0.0045%, and the balance is Fe and inevitable impurity elements; the microstructure of the hot-rolled pickled steel plate is ferrite, a small amount of pearlite and a small amount of carbide, the grain size level of the microstructure is 10-11 levels, the yield strength range is 260-340 MPa, the tensile strength is more than or equal to 390MPa, and the elongation after fracture is more than or equal to 40%.
2. The production method of the hot-rolled pickled plate for the refrigerator compressor shell is characterized by comprising the following steps of:
adopting molten iron pretreatment, pre-slagging and post-slagging, wherein the target S is less than or equal to 0.005 percent after molten iron S is removed; then the mixture is blown by the top and the bottom of the converter; heating in an LF furnace and ensuring that the stirring time of bottom blowing Ar is more than 5 min; performing vacuum cycle degassing treatment in an RH furnace, and adjusting a target value by adopting a light treatment process; ensuring that the net circulation time before breaking is not less than 4 min; reheating a casting blank by a heating furnace, rolling on a continuous hot continuous rolling mill, sequentially carrying out rough rolling, finish rolling, laminar cooling and then coiling to produce a qualified hot rolled coil; hot rolling to improve the plate shape and transverse printing, and acid washing to obtain the final product.
3. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the heating temperature of the casting blank in a heating furnace is set to be 1230-1250 ℃.
4. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the rough rolling finishing temperature is set to 1000-1100 ℃.
5. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the finishing temperature is set to 860-900 ℃.
6. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the coiling temperature range is 620-650 ℃.
7. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the finish rolling working roll of the hot rolling unit is a CVC roll shape, micro-medium wave rolling is adopted, C10 is controlled according to 70 +/-15 mu m, C40 is controlled according to 25 +/-15 mu m, the reduction rate of an F7 frame is less than 10%, and the rolling speed is less than 40 KM.
8. The method for producing the hot-rolled pickled plate for the refrigerator compressor shell as claimed in claim 2, wherein the method comprises the following steps: the hot rolling leveling adopts an elongation percentage mode, and the reduction rate is 2-4%.
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